A material is dimensionally stable at room temperature if its glass transition temperature (T) is
- A. Below room temperature
- B. Just above room temperature
- C. Equal to room temperature
- D. Well above room temperature
Answer: D. Well above room temperature
Explanation: Below Tg, polymers are hard and glassy (stable dimensions). Above Tg, they become rubbery/viscous. For stability, room temp should be < Tg.